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A 10lb dog is standing on a flatboat so that he is 20ft from the shore. He walks 8ft on the boat toward the shore then halts. The boat weighs 40lb and one can assume there is no friction among it and the water. How far is the dog from the shore?
A sinusoidal wave of frequency 350 Hz has a speed of 340 m/s. What is the phase difference between two displacements at a certain point at times 4.0 ms apart
a store sign of mass 4.21 kg is hung by two wires that each make an angle of ? 42.3deg with the ceiling.what is the
Light hits the surface of water (n = 1.33) at an incident angle of 25.0 degrees with respect to the normal line. What is the angle between the reflected ray and the refracted ray? The answer is 136.5 but I'm getting 18.5.
Two radio waves are used in the operation of a cellular telephone. To receive a call, the phone detects the wave emitted at one frequency by the transmitter station or base unit. determine the difference between the two frequencies used in the oper..
A toy train rolls around a horizontal 1.3--diameter track. The coefficient of rolling friction is 0.12. What is the magnitude of the train's angular acceleration
A child and a sled with a combined mass of 50.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 3.00 m/s at the bottom, what is the height of the hill
The outfielder throws a baseball with an initial speed of 10 m/s. An infielder catches the ball at the level 1 m lower speed. determine the speed of the ball and its kinetic energy
A baseball is being caught; its speed goes from 90 to 0 km/hr in about 0.005 s. Its mass is 0.150 kg. What is the size of the force acting on it
A circular loop of flexible iron wire has an initial circumference of 169cm, but its circumference starts to decrease at a constant rate of 10.0cm/s due to a tangential pull on the wire. What is the direction of the induced current in the loop
a mass of 10 kg was hung vertically from a spring. the system obtain equilibrium with a stretched length of 30 cm.a
Assume that a 7.0 cm diameter, 120 W light bulb radiates all its energy as a single wavelength of visible light. Estimate the electric field strength at the surface of the bulb
A satellite weighing 500 kg is in a circular orbit around the earth. It takes exactly 3 hour to go around the earth, What is the force of gravity on this satellite
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